Particles moving higher concentration to a region with a lower concentration. he greater the difference in concentration, the faster the rate of diffusion.
1 of 10
Dissolved substances in a cell
Can move into and out of cells by diffusion.
2 of 10
Oxygen required for respiration
Passes through cell membranes by diffusion.
3 of 10
Osmosis
Water particles moving from more concentrated solution through a partially permeable membrane that allows the passage of water molecules.
4 of 10
Differences in the concentrations of the solutions inside and outside a cell
Causes water to move into or out of the cell by osmosis.
5 of 10
Active transport
Substances are sometimes absorbed against a concentration gradient. This requires the use of energy from respiration.
6 of 10
Active transport in plants
Enables plants to absorb ions from very dilute solutions.
7 of 10
Single-celled organism
Relatively large surface area to volume ratio. All the necessary exchanges occur via its surface membrane.
8 of 10
The effectiveness of an exchange surface is increased by
Having a large surface area that is thin, to provide a short diffusion path. (In animals) having an efficient blood supply ,(in animals, for gaseous exchange) being ventilated.
9 of 10
Gas and solute exchange surfaces
In humans and other organisms are adapted to maximise effectiveness.
10 of 10
Other cards in this set
Card 2
Front
Can move into and out of cells by diffusion.
Back
Dissolved substances in a cell
Card 3
Front
Passes through cell membranes by diffusion.
Back
Card 4
Front
Water particles moving from more concentrated solution through a partially permeable membrane that allows the passage of water molecules.
Back
Card 5
Front
Causes water to move into or out of the cell by osmosis.
Comments
No comments have yet been made